[vorbis-dev] a few questions about the codec

[Nicolas Werner]

Maybe you'll have noticed. I've just realized that I forgot to say that I was
working with the decoder_example.c file and other c source files from CVS. My
apologizes.

Nicolas

Nicolas Werner wrote:

> Hello everybody,
>
> I am a student at the University of Liège and I am working on a vorbis
> decoder on a dsp for my final thesis. I am doing this with Philips. I
> hope this will  help to spread the format.
>
> I am currently working on an integer version of the decoder. I would
> need some help.
>
> - Could anyone explain me a little the floor1 functions principle? What
> theory is it related to ?
>
> - The data  *in  in mdct_backward function seems to be allways between
> -1 and 1. Is that correct ?
>
> - Is the no mapping mode used in codebook ? Is it possible that some
> codebooks references in fullbooks are unused ?
>
> - In the fullbooks structure, how can I know which codebook is for floor
> , and which is for residue ?
>
> - I saw that that the mdct_backward function could also be run as
> integer transform but I read that it was not good enough. Philips has a
> good one. Do you think I could use it (if I take my precautions of
> course) ?
>
> Thank you very much,
>
> Nicolas
>
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